Tuyeres for blast furnaces



p 4, 1962 F. HAACK, JR 3,052,219

TUYERES FOR BLAST FURNACES Filed Nov. 16, 1960 INV EN TOR.

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United States Patent ()fitice 3,052,219 Fatented Sept. 4, 1962 3,052,219 TUYERES FOR BLAST FURNACES Fred Haack, Jr., 2700 N. Campbell Ave., Chicago, Ill. Filed Nov. 16, 1960, Ser. No. 69,675 3 Claims. (Cl. 1226.6)

This invention relates to new and useful improvements in tuyeres for blast furnaces or the like, and it is among the objects thereof to provide a tuyere with a renewable nose piece with means for maintaining proper alignment thereof with the tuyere body and means for fastening the nose piece to the tuyere body by the conduits that deliver the cooling medium for circulation in the tip.

It is a further object of the invention to provide a tuyere of the above-designated character in which a cooling medium such as water is circulated through both the tuyere body and the nose piece from a common source through separate flow paths provided in the tuyere structure.

It is a further object of the invention to utilize spring means for mounting the water circulating conduits to allow for expansion and contraction at the threaded ends of the conduits.

These and other objects of the invention will become more apparent from a consideration of the accompanying drawing constituting a part hereof in which like reference characters designate like parts and in which:

FIGURE 1 is a top plan view of a two-piece tuyere structure embodying the principles of this invention;

FIGURE 2 a cross-sectional view, partially in elevation, showing the main tuyere body and renewable nose piece attached to the body by conduits; and

FIGURE 3 a side elevation of a fragmentary portion of the tuyere and water circulating means.

In the drawing the numeral 1 designates a main tuyere body having a renewable nose piece 2 and having a tapered wall portion 3 by which it is mounted in the wall of a blast furnace, cupola or other industrial metal melting furnace structures. The nose piece 2 has a flow chamber 4 and the body portion has a flow chamber 5 with a sleeve 6 built therein to receive a conduit 7, there being two of such sleeves and conduits as shown. The main body 1 of the tuyere is provided with a recessed end portion 8 for seating the projecting portion 9 of the nose 2, the end of which abuts the end of the body 1, as shown at 10. The nose piece 2 is secured by means of sleeves 7 and 7a having shoulders or flanges 11 and 12 with pipe threads 14 and 15 at their extended end that fit into threaded openings 16 of the nose piece 2. The top ends of the sleeves 7 and 7a are provided with Washers 17 and 18 that constitute seats for springs 19 and 20 that rest against flanges 11 and 12.

As is apparent from FIGURE 2 of the drawing, the nose chamber 4 is an annular chamber and the tuyere body chamber 5 is an annular chamber and the conduits 7 and 7a are connected to a source of coolant such as water and to a drain, respectively, so as to effect a continuous circulation of the coolant in the annular chamber 4. Similarly, the main body chamber 5 is connected by pipe 21 having a pipe threaded connection 22 with the cap of the tuyere it places spaced from the ducts 7 and 7a by an L piece 23 and a valve 24, the L 23 being connected to the pipe 7 and the valve 24 being connected to a T 25 to which the pipe 21 is connected at one end and the top of which is connected at 26 to a source of coolant such as water under pressure. The construction of the double flow system is identical at both connections with the tuyeres, the one constituting the inlet of the cooling system and the other the outlet. The valves 24 control the rate of flow from the source to the tuyere nose.

It is a feature of this invention to provide a practical means of constructing a renewable nose piece and securing the same to the main tuyere body.

To this end, the coil springs 19 and 20 maintain engagement of the nose piece with the end of the tuyere and holds the same against any displacing force to which it might be subjected in normal use. The spring construction, however, allows for expansion and contraction of the conduits 7 and 7a so that the threads 14 and 15 of the ends of these conduits will not be stripped, which would of course destroy the nose piece also. When the nose piece, which is exposed to the extreme heat of the furnace, is renewed the ducts 7 and 7a are unscrewed and a new nose piece inserted in the grooves 8 of the tuyere ends. Because of the chamfered tongue and groove effect of the interacting nose and tuyere body ends, they are properly seated to bring the threads in alignment with the conduits as they extend through the top opening of the tuyere.

Although one embodiment of the invention has been herein illustrated and described, it will be evident to those skilled in the art that various modifications may be made in the details of construction without departing from the principles herein set forth.

I claim:

1. In a tuyere structure a tuyere housing of conical shape for mounting in the wall of a furnace, said housing having an annular cooling chamber, a nose piece constituting a wall of said chamber, a plurality of sleeves abutting the end of the nose piece and extending to the top of the tuyere body, a plurality of conduits disposed in said sleeves having threaded ends engaging threaded openings in said nose piece, the upper end of said conduits being provided with flanges constituting spring seats, washers resting thereon the top of said sleeves constituting spring seats and a spring disposed between said Washers on said sleeves and the flange on said conduits to maintain tension of the nose piece against the tuyere body while permitting expansion and contraction of the conduits without stripping the threaded ends thereof, a plurality of threaded openings at the outer end of the tuyere for receiving cooling pipe, means connecting said pipes to a source of coolant and a drain, said connecting means being connected to the conduits leading to the nose pieces of the tuyere and valves disposed between said conduits and connecting means to control the flow of the coolant to the nose pieces of the tuyeres.

2. A tuyere structure as set forth in claim 1 in which the nose piece is secured by copper tubing yieldingly mounted by coil springs on the main body of the tuyere.

3. A tuyere structure as set forth in claim 1 in which the ends of said pair of conduits extend into an annular chamber in the nose piece and an annular chamber in the tuyere body is connected independently to the same source of coolant and to the same drain with flow control means for independently regulating the flow of coolant through said annular nose piece chamber and the cooling chamber of the main body of the tuyere.

References Cited in the file of this patent UNITED STATES PATENTS 203,056 Mackey Apr. 30, 1878 2,735,409 Aurin et al. Feb. 21, 1956 FOREIGN PATENTS 111,199 Great Britain Nov. 22, 1917 721,531 France Dec. 22, 1931 

